The MIB module to configure and perform Bit Error Rate Testing
(BERT) on DS3, DS1/E1 and DS0/DS0Bundle interfaces.
Bit error rate testing and loopbacks are used by carriers
and ISPs to aid in problem resolution as well as for
testing the quality of T1/E1 or T3/E3 links.  Tests can
be run on a full T1/E1 line or can be run on a fractional
T1/E1 such as single DS0 or a group of DS0s.  By using BERT,
poor quality links could be detected early.
BERT enables the user to test the quality of links by directly
comparing a pseudo-random or repetitive test pattern with
an identical locally generated test pattern. 


BERT: Bit Error Rate Testing (BERT) involves generating a known
data sequence into a transmission device and examining the
received sequence at the same device or a remote device
for errors.

The use of BERT results in the computation of a bit error rate
(BER), which is
		bits received in error
	BER = ------------------------
		number of bits transmitted

To perform a bit error rate test using one tester, 
communications equipment must be placed into a loop-back
mode of operation and the BERT test can then be used to 
determine if equipment is operating correctly.

When running a BERT, system expects to receive the same pattern
that is transmitting.  To help ensure this, two common options
are available.

- Use loopback somewhere in the link or network.  This can
 be accomplished by putting the line in loop up mode;
 send the pattern; find the BER.

- configure remote testing equipment to transmit the Same BERT
  pattern at the same time.

Typical Sequence in Performing Bit Error Rate Test by the 
device is given below:

- Loop Up:
The tester issues special code to force the far end (CPE) into 
loopback.  Upon recognition of the loop activation request code
the CPE enters a loop mode in which it returns the port data
back to the tester.

- Send Pattern:
After a loop has been established, the tester can generate 
test pattern toward the CPE and monitor the incoming data.
- Loop Down:
The tester issues a special code (loop down command) to 
release the far end from the loopback.

Terminology Used:
CPE - Customer's premise equipment.  At CPE, following equipment
is required:
Usually DSU and CSU functions are incorporated by vendors
into a single CSU/DSU unit.
OCU - Office Channel Unit
CSU - Channel Service Unit
A CSU contains the last signal regenerator on the line 
before DTE and mechanism to put the line into loopback
for testing from the central office.
DSU - Data Service Unit.

Imported Objects

MODULE-IDENTITY, OBJECT-TYPE, Counter32, Counter64, Integer32SNMPv2-SMI
ciscoBertMIBObjects .
ciscoBertConfig .
cbConfTable .
cbConfEntry .
cbTestPattern .
cbOperStatus .
cbFailedReason .
cbStartDateAndTime .
cbDS0DPCodeIteration .
cbRowStatus .
cbDs0BitMap .
cbUserPattern .
cbBertTxPatternInv .
cbBertRxPatternInv .
cbLoopback .
cbLoopbackCode .
cbSingleBitErrorInsert .
cbErrorInsertionRate .
cbDuration .
cbStatsTable .
cbStatsEntry .
cbTxBitCountLower .
cbSyncLossCounts .
cbPatternLossCounts .
cbFrameLossCounts .
cbESsCounts .
cbSESsCounts .
cbEFSsCounts .
cbErrorInjectCounts .
cbTxBitCountUpper .
cbHCTxBitCounts .
cbRxBitCountLower .
cbRxBitCountUpper .
cbHCRxBitCounts .
cbRxBitErrCountLower .
cbRxBitErrCountUpper .
cbHCRxBitErrCounts .
ciscoBertMIBConformance .
ciscoBertMIBCompliances .
ciscoBertMIBGroups .